[Bug]: Networks - Deleting Sepolia network throws non-stop errors `No custom network client was found with the ID`

[seaona]

Describe the bug

Deleting Sepolia network throws non-stop errors console errors: No custom network client was found with the ID.
This can spam Sentry.

Expected behavior

Correctly handle deleting Sepolia network, so we don't get infinite errors

Screenshots/Recordings

delete-sepolia.mp4

Steps to reproduce

1. Delete Sepolia network
2. See console errors non-stop

Error messages or log output

Detection stage

In production (default)

Version

12.16.1

Build type

None

Browser

Chrome

Operating system

Linux

Hardware wallet

No response

Additional context

No response

Severity

No response